package zhcms.tool;

import java.security.MessageDigest;

public class GyMd5 {
	private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
        "a", "b", "c", "d", "e", "f" };

	/**
	 * 转换字节数组为16进制字串
	 * 
	 * @param b  字节数组
	 * @return 十六进制字串
	 */
	private String byteArrayToHexString(byte[] b) {
	    StringBuffer resultSb = new StringBuffer();
	    for (int i = 0; i < b.length; i++) {
	        resultSb.append(byteToHexString(b[i]));
	    }
	    return resultSb.toString();
	}
	
	private String byteToHexString(byte b) {
	    int n = b;
	    if (n < 0)
	        n = 256 + n;
	    int d1 = n / 16;
	    int d2 = n % 16;
	    return hexDigits[d1] + hexDigits[d2];
	}
	
	public String MD5Encode(String originString) {
	    String resultString = null;
	    try {
	        MessageDigest md = MessageDigest.getInstance("MD5");
	        resultString = byteArrayToHexString(md.digest(originString.getBytes()));
	    } catch (Exception ex) {
	        ex.printStackTrace();
	    }
	    return resultString;
	}
	
	public static void main(String[] args) {
	    System.err.println(new GyMd5().MD5Encode("888888"));
	}
}
